New Tables of Gemstone Identification

About this book

This book contains the most up-to-date tables for the identification of gemstones. A must for every gemmologist. See the table of contents for further details

Contents

Table 1. Stones are listed with increasing refractive index, using the lowest refractive index value, indicated in red, as a reference. The extremely wide refractive index range of glass would result in a confusing and unnecessary repeating of this substance all through the list. The gemmologist should refer to "Table 6" for further identification.
Table 2. Stones are grouped following their most encountered colours and listed following increasing refractive index.
Table 3. Stones are situated in density groups, increasing with 0.01 density steps. Stones belonging to a particular density group, are listed following optic character and further following refractive index.
Table 4. Stones are listed in alphabetical order.
Table 5. Stones are listed in alphabetical order. Supplementary information (colour, chemical composition, hardness, crystal system, cleavage, lustre, origin, mineral group, magnetic susceptibility, ...) although not immediately related to the identification, provides a possible confirmation of an obtained result.
Table 6. Glass being the most encountered imitation material, its gemmological properties cover a wide range of values.  The relationship between refractive index and density is shown in a graph. The other charts (glass-ceramics, garnet group, enstatite group, feldspath group and emerald) can be helpful for a fast identification.
Table 7. The garnet group represents several commercially important gemstones.  Correct identification may be difficult but is usually possible with the right combination of refractive index, density, spectrum and colour.
Table 8. Diamond imitations with a refractive index above 1.81 are separated in optically isotropic and anisotropic groups and further listed with increasing density.
Table 9. Many stones are in the market sold with incorrect names.  Sometimes it is very confusing for gemstone buyers. Table 9 listed more than 1300 incorrect names used in the gemstone market.
Table 10. Tips & tricks that can help for easier identification of some stones.

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